currently have the 660 installed with nvidia's web driver, would be acquiring a 680 be a massive difference since osx actually has a proper driver for it? and would just any 680 do? i have my eyes on a evga 680 2gb, would that be able to flash so i can boot from a different drive? also i have a gtx 970, but i guess the 680 is the last card apple has a official driver for? i mainly use it for editing but my brother uses it for gaming.